What were you like at 18? How similar was that to you at 25? And now at nearly 30?
People are still developing and growing at that age and I don't think it's worth the risk for a bit of fun. Sure she's an adult legally but I imagine she still has a fair bit of growing up to do.
I'm not saying it wouldn't work, and I'm not saying that would be a massive disaster if it didn't pan out. But think about her/your emotional maturity and the ramifications this might have between the girl and her mother.
People are still developing and growing at that age and I don't think it's worth the risk for a bit of fun. Sure she's an adult legally but I imagine she still has a fair bit of growing up to do.
I'm not saying it wouldn't work, and I'm not saying that would be a massive disaster if it didn't pan out. But think about her/your emotional maturity and the ramifications this might have between the girl and her mother.